Is missed-call text-back legal?

Texting back a person who just called your business, promptly, about the thing they called about, is the ordinary case and it is generally allowed. That is not a loophole. It is the least surprising thing you can do with a number someone dialed you from thirty seconds ago.

Where businesses actually get into trouble is not the text-back itself. It is what they put in the message, what they do when someone says stop, and whether they registered with the carriers at all. Those are three separate rule sets, they come from three different places, and only one of them is a law.

The governing US statute is the Telephone Consumer Protection Act, 47 U.S.C. 227, with the FCC's implementing rules at 47 CFR 64.1200. People sometimes assume it covers voice only. It does not. In its 2003 TCPA Order the FCC confirmed that a text message is a call for TCPA purposes, so every consent rule written for calls applies to SMS as well.

That is the starting point, and it is why a text-back deserves five minutes of thought rather than none. It is also why a lot of the advice you will find written about phone calls is directly relevant to your SMS setup.

The FCC's position here is old and it is stable. In its 1992 TCPA Order the Commission held that persons who knowingly release their phone numbers have in effect given their invitation or permission to be called at the number which they have given, absent instructions to the contrary.

A customer who dials your business has knowingly released their number to you, and they did it for the specific purpose of reaching you about a job. A reply on that subject is the most obviously invited message there is. This is the plain reason a text-back sits in a different category from a cold marketing blast to a purchased list.

The TCPA's strictest consent requirements attach to calls made with an automatic telephone dialing system. For years the scope of that phrase was genuinely unsettled, and courts disagreed about whether ordinary business software counted.

The Supreme Court resolved it on April 1, 2021 in Facebook, Inc. v. Duguid. The Court held that the statutory definition requires equipment that uses a random or sequential number generator. Facebook's login-notification system, which texted specific numbers tied to specific accounts, did not qualify.

A missed-call text-back is the same shape. It does not generate numbers at random or walk a sequence. It replies to the one number that just rang your line. On the federal definition, that is generally not an autodialer.

The TCPA treats two kinds of message very differently. A message that is informational or transactional, answering the thing the person contacted you about, sits in one tier. A message that advertises or promotes sits in a stricter tier that requires prior express written consent, which is a specific, documented thing rather than an inference from behaviour.

This is the single easiest way to turn a defensible text-back into an indefensible one, and it usually happens by accident. Someone decides the auto-reply is wasted space and adds a seasonal discount to it. That one sentence can move the whole message into the tier that needed written consent you never collected.

• Safer: sorry we missed you, what can we help with, when suits you for a visit.
• Riskier: sorry we missed you, and ask about our spring tune-up special, twenty percent off this month.
• The first answers the call. The second sells something they did not ask about.

In February 2024 the FCC adopted an order strengthening a consumer's ability to revoke consent. It is the most operationally specific rule on this page, and compliance has been required since April 11, 2025.

• A person can revoke consent in any reasonable manner. You cannot require them to use one exclusive channel or a particular magic word.
• Replying STOP, or anything that reasonably conveys the same thing, creates a presumption that consent was revoked.
• You must honor a revocation within a reasonable time, not to exceed ten business days from receipt.
• After a revocation you are limited to a single confirmation message, and it must not contain marketing content.

For a text-back system specifically, the thing worth checking is whether opt-outs propagate. It is common for STOP to stop one campaign while another automation keeps messaging the same person from a different number. That is the failure mode this rule is aimed at.

The last layer is not government at all. US carriers require application-to-person messaging sent from standard ten-digit numbers to be registered: a brand and a campaign, filed with The Campaign Registry, describing who you are and what you send. Unregistered traffic gets filtered or blocked.

Because it is a carrier rule rather than a statute, there is no fine to worry about in the ordinary case. The penalty is quieter and arguably worse. Your text-back appears to work in testing, the dashboard shows messages sent, and customers never receive them. If you have ever heard someone say their text-back stopped working for no reason, registration is the first thing to check.

• Reply to the reason they called. Keep promotional content out of the automatic message.
• Send it promptly, while the call is obviously the context for the text.
• Identify your business in the message, so the recipient knows who is texting.
• Make opting out easy, honor it everywhere, and well inside ten business days.
• Register your brand and campaign for A2P 10DLC before you rely on delivery.
• Check your state. Several states have their own texting statutes with definitions broader than the federal one.
• If you handle health, financial, or legal matters, get advice specific to your sector before you automate anything.

None of this is exotic. It is the same instinct you would apply without any statute in front of you: answer the question they asked, do not sell them something they did not ask about, and stop when they say stop. The rules mostly just write that down and attach a deadline to it.

• Telephone Consumer Protection Act of 1991, 47 U.S.C. 227; FCC implementing rules at 47 CFR 64.1200.
• FCC, Report and Order, CC Docket No. 92-90, FCC 92-443 (1992), on persons who knowingly release their phone numbers.
• FCC, Report and Order, CG Docket No. 02-278, 18 FCC Rcd 14014, 14115, para. 165 (2003), confirming that a text message is a call under the TCPA.
• Facebook, Inc. v. Duguid, No. 19-511 (U.S. Apr. 1, 2021), on the definition of an automatic telephone dialing system.
• FCC, Report and Order, CG Docket Nos. 02-278 and 21-402, FCC 24-24 (released February 16, 2024), on revocation of consent; compliance required April 11, 2025.
• A2P 10DLC brand and campaign registration is administered by The Campaign Registry on behalf of US carriers. It is an industry requirement, not a federal rule.

This post is general information about published rules. It is not legal advice, and it does not create any professional relationship. Before you rely on it for your own business, speak to a lawyer who can look at your state, your sector, and the exact wording of your messages.